Toss the Portland Design Works Tiny Object CO2 Inflator in your jersey pocket, hydration pack, or saddle bag along with your CO2 cartridges and spare tube, just in case you get a flat along the way. This compact inflator is designed with rugged alloy and comes with a full-grain leather sleeve that insulates your hands from freezing CO2 cartridges. It only works with Presta valves and features a control knob for regulating the rate of CO2 into your tube.